As a software developer, I am interested in how quickly I should jump on the new Panther features. I.e. will it take half a year before my potential users have upgraded to Panther?

Naturally it depends on the kind of users, but does anybody have any insight to how quick people are to upgrade?

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Generally a massive proportion upgrade to start (perhaps 30-40%) and then over time that rises. At this time my server logs indicate 7% Panther (before release), 72% Jaguar, 8% Puma and 13% Mac OS 9 or Windows. At this time I am incorporating Panther features but making sure that I check the version of Mac OS X (they are coded features). I have all my software compatible back to 10.0 using this method.